The JBX01090 400GBASE-DR4 QSFP-DD transceiver represents the cutting edge of high-speed optical networking technology, purpose-built for modern data centers requiring 400GB connectivity without premium long-distance pricing. **Key Specifications:** This transceiver operates at 400GB data rates using the DR4 (Distance Reach 4) protocol, enabling 500-meter transmission distances over standard 9/125 single-mode fiber. The MTP/MPO-12/APC connector provides a compact, high-density interface ideal for switch port optimization and space-constrained environments. **Performance & Reliability:** The 1310nm wavelength design minimizes fiber dispersion while the dual-fiber architecture ensures full-duplex communication. Qualified to IEEE 802.3bs and QSFP-DD MSA standards, this module integrates seamlessly with Cisco infrastructure and third-party compatible equipment. **Enterprise-Grade Quality:** Manufactured with precision in Vietnam and China, the transceiver features a robust metal case with integrated laser transmitter technology. It carries Class 1 laser safety certification (LN #50 7/2001), FDA compliance (21CFR 1040.10), TUV certification, and full RoHS/ELV directive adherence, ensuring safe operation in regulated environments. **Operating Conditions:** Designed for real-world deployment, it operates reliably across 0-70°C (32-158°F) temperature ranges, supporting both air-cooled and liquid-cooled data center architectures. **Value Proposition:** As a Cisco QDD-400G-DR4-S compatible solution, this transceiver delivers OEM performance at competitive pricing. Custom brand programming is available for resellers and system integrators. Backed by a 90-day limited warranty and available with free standard shipping on orders exceeding $99, it combines quality, compatibility, and affordability. **Perfect For:** Large-scale data centers, cloud service providers, research institutions, and enterprises upgrading to 400GB networking infrastructure.